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Question (21)

QN00331

Which utensil surface will absorb the least heat from sunlight?

(A) Black rough surface
(B) White dull surface
(C) Polished silver surface
(D) Dark brown surface

Correct Answer: C

Explanation:

Polished silver reflects most radiation.

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Question (22)

QN00332

Why are solar cookers painted black from inside?

(A) Black surfaces reflect heat
(B) Black surfaces absorb more heat
(C) Black surfaces reduce sunlight
(D) Black surfaces cool quickly

Correct Answer: B

Explanation:

Black surfaces absorb maximum heat radiation.

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Question (23)

QN00333

Which process of heat transfer occurs fastest through space?

(A) Conduction
(B) Convection
(C) Radiation
(D) Evaporation

Correct Answer: C

Explanation:

Radiation travels through space without medium.

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Question (24)

QN00334

Why does a person wearing black clothes feel hotter in sunlight?

(A) Black reflects sunlight
(B) Black absorbs more radiation
(C) Black stops convection
(D) Black increases air flow

Correct Answer: B

Explanation:

Black clothes absorb more heat.

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Question (25)

QN00335

Which of the following does NOT require contact between objects for heat transfer?

(A) Conduction
(B) Radiation
(C) Friction
(D) Compression

Correct Answer: B

Explanation:

Radiation transfers heat without contact.

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Question (26)

QN00336

Which type of clothes is most suitable during hot summer afternoons?

(A) Thick black woollen clothes
(B) Dark blue silk clothes
(C) Light-coloured cotton clothes
(D) Black leather clothes

Correct Answer: C

Explanation:

Light colours reflect heat and cotton absorbs sweat.

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Question (27)

QN00337

Heat from a fireplace reaches nearby people mainly through —

(A) radiation
(B) condensation
(C) freezing
(D) melting

Correct Answer: A

Explanation:

Heat spreads outward from fire by radiation.

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Question (28)

QN00338

Which statement best explains why radiation is different from conduction and convection?

(A) Radiation occurs only in solids
(B) Radiation requires moving particles
(C) Radiation does not need any medium
(D) Radiation happens only at high temperature

Correct Answer: C

Explanation:

Radiation can occur even in vacuum.

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Question (29)

QN00339

Which surface is the poorest absorber of radiant heat?

(A) Black surface
(B) Rough dark surface
(C) White polished surface
(D) Dark cloth surface

Correct Answer: C

Explanation:

White polished surfaces reflect most heat.

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Question (30)

QN00340

Why does the Earth receive heat from the Sun even though space is nearly empty?

(A) Space contains air
(B) Radiation does not require a medium
(C) Convection occurs in space
(D) Conduction takes place through vacuum

Correct Answer: B

Explanation:

Radiation transfers heat through vacuum.

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Question (21)

Which utensil surface will absorb the least heat from sunlight?

Explanation:

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Question (22)

Why are solar cookers painted black from inside?

Explanation:

Link:

Question (23)

Which process of heat transfer occurs fastest through space?

Explanation:

Link:

Question (24)

Why does a person wearing black clothes feel hotter in sunlight?

Explanation:

Link:

Question (25)

Which of the following does NOT require contact between objects for heat transfer?

Explanation:

Link:

Question (26)

Which type of clothes is most suitable during hot summer afternoons?

Explanation:

Link:

Question (27)

Heat from a fireplace reaches nearby people mainly through —

Explanation:

Link:

Question (28)

Which statement best explains why radiation is different from conduction and convection?

Explanation:

Link:

Question (29)

Which surface is the poorest absorber of radiant heat?

Explanation:

Link:

Question (30)

Why does the Earth receive heat from the Sun even though space is nearly empty?

Explanation:

Link:

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